I'm lucky, in some ways, that I live in Florida where birds sing and flowers bloom year round. I have, however, visited the northern areas of the United States on several occasions during winter. When ever I spent too much time in the snow I missed the greenery of Florida. This fact lead me to want to find out if any flowers grew wild up north during winter. After clicking through a couple of “Google” pages I found one that does grow up north, even in the southern region of Canada.
The Winter Aconite (Eranthis hyemali) grows in USDA plant zones three through seven. This means that even those who live as far north as Canada can enjoy this wonderful yellow flowering plant with deep green leaves. The Winter Aconite is known to bloom in February but the majority of plants flower during March, at the very beginning of spring. I have heard it reported that some gardeners and observers of this plant, that is relating to buttercups, see the yellow buds begin to grow beneath the snow.
Winter Anconite grows wild in locations throughout Europe where it mixes with buttercups and daisies, depending on the specific location, according to aboutflowers.org. This website reported seeing blooms appear at Christmas in parts of Italy. Which means that, given a somewhat warmer climate, the plant can produce buds when other flowers couldn't survive the temperatures typically seen in the middle of December.
Gardeners from USDA plant zones three through seven can plant Winter Anconite in full sun to partial shade. The Missouri Botanical Garden website recommends planting in soil well-drained, partially moist organic soil. Find a spot where the plant will enjoy full sun while the flowers bloom and will sit in the shade once the trees regain their leaves during the spring. The flowering plant needs an adequate amount of moisture throughout the year. Wet down the tubers the night before you plant them. Place them in the ground 2 to 3 inches deep and 3 inches apart during the planting season of late summer to early fall.
One of the key facts I've heard about the Winter Anconite is that you don't need to pay it much attention once it's in the ground. These plants are hardy and can do very when left alone.